This implies that the mean upwelling (\(\overline{w}\) ) correlates
with eddy momentum flux convergence, and therefore with the equatorial
superrotating jet at the equatorial region. Since the superrotating
jet is supposed to be driven by angular momentum fluxes in the direction
perpendicular to the rotation axis [1]}, [2]}, [3]},
converging in the equatorial region, Eq. REF 
would take the more general form
\(\overline{w_{\perp }}=-\frac{1}{2\rho _{m}\Omega }\partial _{\perp }\left(\overline{w_{\perp }^{\prime }u^{\prime }}\rho _{m}\right)>0,\) 
